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Particle-in-cell simulations of the impact of retarding field analyser probe head geometry on ion saturation current measurements
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SYSNO ASEP 0103214 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Particle-in-cell simulations of the impact of retarding field analyser probe head geometry on ion saturation current measurements Title Particle-in-cell simulace vlivu tvaru hlavice sondy Retarding field analyzátoru na měření iontového nasyceného proudu Author(s) Pánek, Radomír (UFP-V) RID
Pitts, R. A. (CH)
Gunn, J. P. (FR)
Erents, S. K. (GB)Source Title Czechoslovak Journal of Physics. - : Springer - ISSN 0011-4626
Roč. 54, suppl.C (2004), C150-C156Number of pages 7 s. Publication form CD-ROM - CD-ROM Action Symposium on Plasma Physics and Technology /21./ Event date 14.06.2004-17.06.2004 VEvent location Praha Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords retarding field analyser, magnetic pre-sheath, plasma flow, tunnel effect Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects GP202/03/P062 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z2043910 - UFP-V Annotation The Retarding Field Analyser (RFA) is essentially the only practical tool for the measurement of ion energies parallel to the total magnetic field in the tokamak scrape of layer plasma. One such device has recently been successfully employed at JET. Its bi-directional nature allows both measurements of ion temperature and plasma flow velocities. The latter are computed by collecting the ion saturation flux to negatively biased entrance slit plates which are set back inside a boron nitride protective housing. When comparing the RFA slit currents with those measured by a turbulent transport probe (TTP), the RFA fluxes are found to be a factor 4-5 lower for very similar plasma conditions. Using Particle-in-Cell (PIC) simulations, this contribution demonstrates unambiguously and quantitatively, that the RFA flux attenuation is induced by the magnetic pre-sheath formed in the orifice in front of the slit plates. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2005
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